Which PROC step would you use to view the contents of a library?

When you want to view the contents of a library in SAS, the appropriate procedure to use is PROC CONTENTS. This procedure provides a detailed overview of the datasets contained within the specified library, including information about the variables, data types, and attributes of each dataset.

PROC CONTENTS generates a report that helps users understand the structure of their data, including the number of observations and variables for each dataset in the library, making it an essential tool for data exploration and management. It also allows users to specify certain options to tailor the output to their needs, such as limiting the results to certain datasets or displaying specific variables.

Other procedures mentioned, such as PROC PRINT, are designed for displaying the data within a dataset, and PROC SUMMARY is used for summarizing data rather than giving a comprehensive overview of the library's contents. PROC VIEW is not a standard or recognized PROC in SAS for this purpose. Thus, PROC CONTENTS stands out as the best choice for reviewing the structure and metadata of datasets within a library.